scheduler/process.c

   1 /*
   2  * "$Id$"
   3  *
   4  * Process management routines for the CUPS scheduler.
   5  *
   6  * Copyright 2007-2014 by Apple Inc.
   7  * Copyright 1997-2007 by Easy Software Products, all rights reserved.
   8  *
   9  * These coded instructions, statements, and computer programs are the
  10  * property of Apple Inc. and are protected by Federal copyright
  11  * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  * which should have been included with this file.  If this file is
  13  * file is missing or damaged, see the license at "http://www.cups.org/".
  14  */
  15
  16 /*
  17  * Include necessary headers...
  18  */
  19
  20 #include "cupsd.h"
  21 #include <grp.h>
  22 #ifdef __APPLE__
  23 #  include <libgen.h>
  24 #endif /* __APPLE__ */
  25 #ifdef HAVE_POSIX_SPAWN
  26 #  include <spawn.h>
  27 extern char **environ;
  28 #endif /* HAVE_POSIX_SPAWN */
  29
  30
  31 /*
  32  * Process structure...
  33  */
  34
  35 typedef struct
  36 {
  37   int   pid,                            /* Process ID */
  38         job_id;                         /* Job associated with process */
  39   char  name[1];                        /* Name of process */
  40 } cupsd_proc_t;
  41
  42
  43 /*
  44  * Local globals...
  45  */
  46
  47 static cups_array_t     *process_array = NULL;
  48
  49
  50 /*
  51  * Local functions...
  52  */
  53
  54 static int      compare_procs(cupsd_proc_t *a, cupsd_proc_t *b);
  55 #ifdef HAVE_SANDBOX_H
  56 static char     *cupsd_requote(char *dst, const char *src, size_t dstsize);
  57 #endif /* HAVE_SANDBOX_H */
  58
  59
  60 /*
  61  * 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
  62  */
  63
  64 void *                                  /* O - Profile or NULL on error */
  65 cupsdCreateProfile(int job_id,          /* I - Job ID or 0 for none */
  66                    int allow_networking)/* I - Allow networking off machine? */
  67 {
  68 #ifdef HAVE_SANDBOX_H
  69   cups_file_t           *fp;            /* File pointer */
  70   char                  profile[1024],  /* File containing the profile */
  71                         bin[1024],      /* Quoted ServerBin */
  72                         cache[1024],    /* Quoted CacheDir */
  73                         domain[1024],   /* Domain socket, if any */
  74                         request[1024],  /* Quoted RequestRoot */
  75                         root[1024],     /* Quoted ServerRoot */
  76                         temp[1024];     /* Quoted TempDir */
  77   const char            *nodebug;       /* " (with no-log)" for no debug */
  78   cupsd_listener_t      *lis;           /* Current listening socket */
  79
  80
  81   if (!UseSandboxing || Sandboxing == CUPSD_SANDBOXING_OFF)
  82   {
  83    /*
  84     * Only use sandbox profiles as root...
  85     */
  86
  87     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  88
  89     return (NULL);
  90   }
  91
  92   if ((fp = cupsTempFile2(profile, sizeof(profile))) == NULL)
  93   {
  94     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
  95     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create security profile: %s",
  96                     strerror(errno));
  97     return (NULL);
  98   }
  99
 100   fchown(cupsFileNumber(fp), RunUser, Group);
 101   fchmod(cupsFileNumber(fp), 0640);
 102
 103   cupsd_requote(bin, ServerBin, sizeof(bin));
 104   cupsd_requote(cache, CacheDir, sizeof(cache));
 105   cupsd_requote(request, RequestRoot, sizeof(request));
 106   cupsd_requote(root, ServerRoot, sizeof(root));
 107   cupsd_requote(temp, TempDir, sizeof(temp));
 108
 109   nodebug = LogLevel < CUPSD_LOG_DEBUG ? " (with no-log)" : "";
 110
 111   cupsFilePuts(fp, "(version 1)\n");
 112   if (Sandboxing == CUPSD_SANDBOXING_STRICT)
 113     cupsFilePuts(fp, "(deny default)\n");
 114   else
 115     cupsFilePuts(fp, "(allow default)\n");
 116   if (LogLevel >= CUPSD_LOG_DEBUG)
 117     cupsFilePuts(fp, "(debug deny)\n");
 118   cupsFilePuts(fp, "(import \"system.sb\")\n");
 119   cupsFilePuts(fp, "(system-network)\n");
 120   cupsFilePuts(fp, "(allow mach-per-user-lookup)\n");
 121   cupsFilePuts(fp, "(allow ipc-posix-sem)\n");
 122   cupsFilePuts(fp, "(allow ipc-posix-shm)\n");
 123   cupsFilePuts(fp, "(allow ipc-sysv-shm)\n");
 124   cupsFilePuts(fp, "(allow mach-lookup)\n");
 125   cupsFilePrintf(fp,
 126                  "(deny file-write* file-read-data file-read-metadata\n"
 127                  "  (regex"
 128                  " #\"^%s$\""           /* RequestRoot */
 129                  " #\"^%s/\""           /* RequestRoot/... */
 130                  ")%s)\n",
 131                  request, request, nodebug);
 132   if (!RunUser)
 133     cupsFilePrintf(fp,
 134                    "(deny file-write* file-read-data file-read-metadata\n"
 135                    "  (regex"
 136                    " #\"^/Users$\""
 137                    " #\"^/Users/\""
 138                    ")%s)\n", nodebug);
 139   cupsFilePrintf(fp,
 140                  "(deny file-write*\n"
 141                  "  (regex"
 142                  " #\"^%s$\""           /* ServerRoot */
 143                  " #\"^%s/\""           /* ServerRoot/... */
 144                  " #\"^/private/etc$\""
 145                  " #\"^/private/etc/\""
 146                  " #\"^/usr/local/etc$\""
 147                  " #\"^/usr/local/etc/\""
 148                  " #\"^/Library$\""
 149                  " #\"^/Library/\""
 150                  " #\"^/System$\""
 151                  " #\"^/System/\""
 152                  ")%s)\n",
 153                  root, root, nodebug);
 154   /* Specifically allow applications to stat RequestRoot and some other system folders */
 155   cupsFilePrintf(fp,
 156                  "(allow file-read-metadata\n"
 157                  "  (regex"
 158                  " #\"^/$\""            /* / */
 159                  " #\"^/usr$\""         /* /usr */
 160                  " #\"^/Library$\""     /* /Library */
 161                  " #\"^/Library/Printers$\""    /* /Library/Printers */
 162                  " #\"^%s$\""           /* RequestRoot */
 163                  "))\n",
 164                  request);
 165   /* Read and write TempDir, CacheDir, and other common folders */
 166   cupsFilePrintf(fp,
 167                  "(allow file-write* file-read-data file-read-metadata\n"
 168                  "  (regex"
 169                  " #\"^%s$\""           /* TempDir */
 170                  " #\"^%s/\""           /* TempDir/... */
 171                  " #\"^%s$\""           /* CacheDir */
 172                  " #\"^%s/\""           /* CacheDir/... */
 173                  " #\"^/private/var/folders/\""
 174                  " #\"^/Library/Application Support/\""
 175                  " #\"^/Library/Caches/\""
 176                  " #\"^/Library/Preferences/\""
 177                  " #\"^/Users/Shared/\""
 178                  "))\n",
 179                  temp, temp, cache, cache);
 180   /* Read common folders */
 181   cupsFilePrintf(fp,
 182                  "(allow file-read-data file-read-metadata\n"
 183                  "  (literal \"/private/etc/services\")\n"
 184                  "  (regex"
 185                  " #\"^/bin$\""         /* /bin */
 186                  " #\"^/bin/\""         /* /bin/... */
 187                  " #\"^/usr/bin$\""     /* /usr/bin */
 188                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 189                  " #\"^/usr/libexec/cups$\""    /* /usr/libexec/cups */
 190                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 191                  " #\"^/usr/sbin$\""    /* /usr/sbin */
 192                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 193                  " #\"^/Library/Caches$\""
 194                  " #\"^/Library/Fonts$\""
 195                  " #\"^/Library/Fonts/\""
 196                  " #\"^/Library/Printers$\""
 197                  " #\"^/Library/Printers/.*$\""
 198                  " #\"^%s/Library$\""   /* RequestRoot/Library */
 199                  " #\"^%s/Library/\""   /* RequestRoot/Library/... */
 200                  " #\"^%s$\""           /* ServerBin */
 201                  " #\"^%s/\""           /* ServerBin/... */
 202                  " #\"^%s$\""           /* ServerRoot */
 203                  " #\"^%s/\""           /* ServerRoot/... */
 204                  "))\n",
 205                  request, request, bin, bin, root, root);
 206   if (Sandboxing == CUPSD_SANDBOXING_RELAXED)
 207   {
 208     /* Limited write access to /Library/Printers/... */
 209     cupsFilePuts(fp,
 210                  "(allow file-write*\n"
 211                  "  (regex"
 212                  " #\"^/Library/Printers/.*/\""
 213                  "))\n");
 214     cupsFilePrintf(fp,
 215                    "(deny file-write*\n"
 216                    "  (regex"
 217                    " #\"^/Library/Printers/PPDs$\""
 218                    " #\"^/Library/Printers/PPDs/\""
 219                    " #\"^/Library/Printers/PPD Plugins$\""
 220                    " #\"^/Library/Printers/PPD Plugins/\""
 221                    ")%s)\n", nodebug);
 222   }
 223   /* Allow execution of child processes */
 224   cupsFilePuts(fp, "(allow process-fork)\n");
 225   cupsFilePrintf(fp,
 226                  "(allow process-exec\n"
 227                  "  (regex"
 228                  " #\"^/bin/\""         /* /bin/... */
 229                  " #\"^/usr/bin/\""     /* /usr/bin/... */
 230                  " #\"^/usr/libexec/cups/\""    /* /usr/libexec/cups/... */
 231                  " #\"^/usr/sbin/\""    /* /usr/sbin/... */
 232                  " #\"^%s/\""           /* ServerBin/... */
 233                  " #\"^/Library/Printers/.*/\""
 234                  "))\n",
 235                  bin);
 236   if (RunUser && getenv("CUPS_TESTROOT"))
 237   {
 238     /* Allow source directory access in "make test" environment */
 239     char        testroot[1024];         /* Root directory of test files */
 240
 241     cupsd_requote(testroot, getenv("CUPS_TESTROOT"), sizeof(testroot));
 242
 243     cupsFilePrintf(fp,
 244                    "(allow file-write* file-read-data file-read-metadata\n"
 245                    "  (regex"
 246                    " #\"^%s$\""         /* CUPS_TESTROOT */
 247                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 248                    "))\n",
 249                    testroot, testroot);
 250     cupsFilePrintf(fp,
 251                    "(allow process-exec\n"
 252                    "  (regex"
 253                    " #\"^%s/\""         /* CUPS_TESTROOT/... */
 254                    "))\n",
 255                    testroot);
 256   }
 257   if (job_id)
 258   {
 259     /* Allow job filters to read the current job files... */
 260     cupsFilePrintf(fp,
 261                    "(allow file-read-data file-read-metadata\n"
 262                    "       (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
 263                    request, job_id, job_id);
 264   }
 265   else
 266   {
 267     /* Allow email notifications from notifiers... */
 268     cupsFilePuts(fp,
 269                  "(allow process-exec\n"
 270                  "  (literal \"/usr/sbin/sendmail\")\n"
 271                  "  (with no-sandbox))\n");
 272   }
 273   /* Allow outbound networking to local mDNSResponder and cupsd */
 274   cupsFilePuts(fp, "(allow network-outbound"
 275                    "\n       (literal \"/private/var/run/mDNSResponder\")");
 276   for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 277        lis;
 278        lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 279   {
 280     if (httpAddrFamily(&(lis->address)) == AF_LOCAL)
 281     {
 282       httpAddrString(&(lis->address), domain, sizeof(domain));
 283       cupsFilePrintf(fp, "\n       (literal \"%s\")", domain);
 284     }
 285   }
 286   if (allow_networking)
 287   {
 288     /* Allow TCP and UDP networking off the machine... */
 289     cupsFilePuts(fp, "\n       (remote tcp))\n");
 290     cupsFilePuts(fp, "(allow network*\n"
 291                      "       (local udp \"*:*\")\n"
 292                      "       (remote udp \"*:*\"))\n");
 293   }
 294   else
 295   {
 296     /* Only allow SNMP (UDP) off the machine... */
 297     cupsFilePuts(fp, ")\n");
 298     cupsFilePuts(fp, "(allow network-outbound\n"
 299                      "       (remote udp \"*:161\"))\n");
 300     cupsFilePuts(fp, "(allow network-inbound\n"
 301                      "       (local udp \"localhost:*\"))\n");
 302   }
 303   cupsFileClose(fp);
 304
 305   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d,allow_networking=%d) = \"%s\"", job_id, allow_networking, profile);
 306   return ((void *)strdup(profile));
 307
 308 #else
 309   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCreateProfile(job_id=%d, allow_networking=%d) = NULL", job_id, allow_networking);
 310
 311   return (NULL);
 312 #endif /* HAVE_SANDBOX_H */
 313 }
 314
 315
 316 /*
 317  * 'cupsdDestroyProfile()' - Delete an execution profile.
 318  */
 319
 320 void
 321 cupsdDestroyProfile(void *profile)      /* I - Profile */
 322 {
 323   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdDeleteProfile(profile=\"%s\")",
 324                   profile ? (char *)profile : "(null)");
 325
 326 #ifdef HAVE_SANDBOX_H
 327   if (profile)
 328   {
 329     unlink((char *)profile);
 330     free(profile);
 331   }
 332 #endif /* HAVE_SANDBOX_H */
 333 }
 334
 335
 336 /*
 337  * 'cupsdEndProcess()' - End a process.
 338  */
 339
 340 int                                     /* O - 0 on success, -1 on failure */
 341 cupsdEndProcess(int pid,                /* I - Process ID */
 342                 int force)              /* I - Force child to die */
 343 {
 344   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdEndProcess(pid=%d, force=%d)", pid,
 345                   force);
 346
 347   if (!pid)
 348     return (0);
 349
 350   if (!RunUser)
 351   {
 352    /*
 353     * When running as root, cupsd puts child processes in their own process
 354     * group.  Using "-pid" sends a signal to all processes in the group.
 355     */
 356
 357     pid = -pid;
 358   }
 359
 360   if (force)
 361     return (kill(pid, SIGKILL));
 362   else
 363     return (kill(pid, SIGTERM));
 364 }
 365
 366
 367 /*
 368  * 'cupsdFinishProcess()' - Finish a process and get its name.
 369  */
 370
 371 const char *                            /* O - Process name */
 372 cupsdFinishProcess(int  pid,            /* I - Process ID */
 373                    char *name,          /* I - Name buffer */
 374                    int  namelen,        /* I - Size of name buffer */
 375                    int  *job_id)        /* O - Job ID pointer or NULL */
 376 {
 377   cupsd_proc_t  key,                    /* Search key */
 378                 *proc;                  /* Matching process */
 379
 380
 381   key.pid = pid;
 382
 383   if ((proc = (cupsd_proc_t *)cupsArrayFind(process_array, &key)) != NULL)
 384   {
 385     if (job_id)
 386       *job_id = proc->job_id;
 387
 388     strlcpy(name, proc->name, namelen);
 389     cupsArrayRemove(process_array, proc);
 390     free(proc);
 391   }
 392   else
 393   {
 394     if (job_id)
 395       *job_id = 0;
 396
 397     strlcpy(name, "unknown", namelen);
 398   }
 399
 400   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 401                   "cupsdFinishProcess(pid=%d, name=%p, namelen=%d, "
 402                   "job_id=%p(%d)) = \"%s\"", pid, name, namelen, job_id,
 403                   job_id ? *job_id : 0, name);
 404
 405   return (name);
 406 }
 407
 408
 409 /*
 410  * 'cupsdStartProcess()' - Start a process.
 411  */
 412
 413 int                                     /* O - Process ID or 0 */
 414 cupsdStartProcess(
 415     const char  *command,               /* I - Full path to command */
 416     char        *argv[],                /* I - Command-line arguments */
 417     char        *envp[],                /* I - Environment */
 418     int         infd,                   /* I - Standard input file descriptor */
 419     int         outfd,                  /* I - Standard output file descriptor */
 420     int         errfd,                  /* I - Standard error file descriptor */
 421     int         backfd,                 /* I - Backchannel file descriptor */
 422     int         sidefd,                 /* I - Sidechannel file descriptor */
 423     int         root,                   /* I - Run as root? */
 424     void        *profile,               /* I - Security profile to use */
 425     cupsd_job_t *job,                   /* I - Job associated with process */
 426     int         *pid)                   /* O - Process ID */
 427 {
 428   int           i;                      /* Looping var */
 429   const char    *exec_path = command;   /* Command to be exec'd */
 430   char          *real_argv[110],        /* Real command-line arguments */
 431                 cups_exec[1024];        /* Path to "cups-exec" program */
 432   uid_t         user;                   /* Command UID */
 433   cupsd_proc_t  *proc;                  /* New process record */
 434 #ifdef HAVE_POSIX_SPAWN
 435   posix_spawn_file_actions_t actions;   /* Spawn file actions */
 436   posix_spawnattr_t attrs;              /* Spawn attributes */
 437   char          user_str[16],           /* User string */
 438                 group_str[16],          /* Group string */
 439                 nice_str[16];           /* FilterNice string */
 440 #endif /* HAVE_POSIX_SPAWN */
 441 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
 442   struct sigaction action;              /* POSIX signal handler */
 443 #endif /* HAVE_SIGACTION && !HAVE_SIGSET */
 444 #if defined(__APPLE__)
 445   char          processPath[1024],      /* CFProcessPath environment variable */
 446                 linkpath[1024];         /* Link path for symlinks... */
 447   int           linkbytes;              /* Bytes for link path */
 448 #endif /* __APPLE__ */
 449
 450
 451   *pid = 0;
 452
 453  /*
 454   * Figure out the UID for the child process...
 455   */
 456
 457   if (RunUser)
 458     user = RunUser;
 459   else if (root)
 460     user = 0;
 461   else
 462     user = User;
 463
 464  /*
 465   * Check the permissions of the command we are running...
 466   */
 467
 468   if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
 469                      cupsdLogFCMessage, job ? job->printer : NULL))
 470     return (0);
 471
 472 #if defined(__APPLE__)
 473   if (envp)
 474   {
 475    /*
 476     * Add special voodoo magic for OS X - this allows OS X programs to access
 477     * their bundle resources properly...
 478     */
 479
 480     if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
 481     {
 482      /*
 483       * Yes, this is a symlink to the actual program, nul-terminate and
 484       * use it...
 485       */
 486
 487       linkpath[linkbytes] = '\0';
 488
 489       if (linkpath[0] == '/')
 490         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
 491                  linkpath);
 492       else
 493         snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
 494                  dirname((char *)command), linkpath);
 495     }
 496     else
 497       snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
 498
 499     envp[0] = processPath;              /* Replace <CFProcessPath> string */
 500   }
 501 #endif  /* __APPLE__ */
 502
 503  /*
 504   * Use helper program when we have a sandbox profile...
 505   */
 506
 507 #ifndef HAVE_POSIX_SPAWN
 508   if (profile)
 509 #endif /* !HAVE_POSIX_SPAWN */
 510   {
 511     snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
 512     snprintf(user_str, sizeof(user_str), "%d", user);
 513     snprintf(group_str, sizeof(group_str), "%d", Group);
 514     snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
 515
 516     real_argv[0] = cups_exec;
 517     real_argv[1] = (char *)"-g";
 518     real_argv[2] = group_str;
 519     real_argv[3] = (char *)"-n";
 520     real_argv[4] = nice_str;
 521     real_argv[5] = (char *)"-u";
 522     real_argv[6] = user_str;
 523     real_argv[7] = profile;
 524     real_argv[8] = (char *)command;
 525
 526     for (i = 0;
 527          i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
 528          i ++)
 529       real_argv[i + 9] = argv[i];
 530
 531     real_argv[i + 9] = NULL;
 532
 533     argv      = real_argv;
 534     exec_path = cups_exec;
 535   }
 536
 537   if (LogLevel == CUPSD_LOG_DEBUG2)
 538   {
 539     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
 540
 541     for (i = 0; argv[i]; i ++)
 542       cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
 543   }
 544
 545 #ifdef HAVE_POSIX_SPAWN
 546  /*
 547   * Setup attributes and file actions for the spawn...
 548   */
 549
 550   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
 551   posix_spawnattr_init(&attrs);
 552   posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
 553
 554   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
 555   posix_spawn_file_actions_init(&actions);
 556   if (infd != 0)
 557   {
 558     if (infd < 0)
 559       posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_WRONLY, 0);
 560     else
 561       posix_spawn_file_actions_adddup2(&actions, infd, 0);
 562   }
 563
 564   if (outfd != 1)
 565   {
 566     if (outfd < 0)
 567       posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
 568     else
 569       posix_spawn_file_actions_adddup2(&actions, outfd, 1);
 570   }
 571
 572   if (errfd != 2)
 573   {
 574     if (errfd < 0)
 575       posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
 576     else
 577       posix_spawn_file_actions_adddup2(&actions, errfd, 2);
 578   }
 579
 580   if (backfd != 3 && backfd >= 0)
 581     posix_spawn_file_actions_adddup2(&actions, backfd, 3);
 582
 583   if (sidefd != 4 && sidefd >= 0)
 584     posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
 585
 586   cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
 587
 588   if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
 589   {
 590     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
 591
 592     *pid = 0;
 593   }
 594   else
 595     cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
 596
 597   posix_spawn_file_actions_destroy(&actions);
 598   posix_spawnattr_destroy(&attrs);
 599
 600 #else
 601  /*
 602   * Block signals before forking...
 603   */
 604
 605   cupsdHoldSignals();
 606
 607   if ((*pid = fork()) == 0)
 608   {
 609    /*
 610     * Child process goes here; update stderr as needed...
 611     */
 612
 613     if (errfd != 2)
 614     {
 615       if (errfd < 0)
 616         errfd = open("/dev/null", O_WRONLY);
 617
 618       if (errfd != 2)
 619       {
 620         dup2(errfd, 2);
 621         close(errfd);
 622       }
 623     }
 624
 625    /*
 626     * Put this process in its own process group so that we can kill any child
 627     * processes it creates.
 628     */
 629
 630 #  ifdef HAVE_SETPGID
 631     if (!RunUser && setpgid(0, 0))
 632       exit(errno + 100);
 633 #  else
 634     if (!RunUser && setpgrp())
 635       exit(errno + 100);
 636 #  endif /* HAVE_SETPGID */
 637
 638    /*
 639     * Update the remaining file descriptors as needed...
 640     */
 641
 642     if (infd != 0)
 643     {
 644       if (infd < 0)
 645         infd = open("/dev/null", O_RDONLY);
 646
 647       if (infd != 0)
 648       {
 649         dup2(infd, 0);
 650         close(infd);
 651       }
 652     }
 653
 654     if (outfd != 1)
 655     {
 656       if (outfd < 0)
 657         outfd = open("/dev/null", O_WRONLY);
 658
 659       if (outfd != 1)
 660       {
 661         dup2(outfd, 1);
 662         close(outfd);
 663       }
 664     }
 665
 666     if (backfd != 3 && backfd >= 0)
 667     {
 668       dup2(backfd, 3);
 669       close(backfd);
 670       fcntl(3, F_SETFL, O_NDELAY);
 671     }
 672
 673     if (sidefd != 4 && sidefd >= 0)
 674     {
 675       dup2(sidefd, 4);
 676       close(sidefd);
 677       fcntl(4, F_SETFL, O_NDELAY);
 678     }
 679
 680    /*
 681     * Change the priority of the process based on the FilterNice setting.
 682     * (this is not done for root processes...)
 683     */
 684
 685     if (!root)
 686       nice(FilterNice);
 687
 688    /*
 689     * Reset group membership to just the main one we belong to.
 690     */
 691
 692     if (!RunUser && setgid(Group))
 693       exit(errno + 100);
 694
 695     if (!RunUser && setgroups(1, &Group))
 696       exit(errno + 100);
 697
 698    /*
 699     * Change user to something "safe"...
 700     */
 701
 702     if (!RunUser && user && setuid(user))
 703       exit(errno + 100);
 704
 705    /*
 706     * Change umask to restrict permissions on created files...
 707     */
 708
 709     umask(077);
 710
 711    /*
 712     * Unblock signals before doing the exec...
 713     */
 714
 715 #  ifdef HAVE_SIGSET
 716     sigset(SIGTERM, SIG_DFL);
 717     sigset(SIGCHLD, SIG_DFL);
 718     sigset(SIGPIPE, SIG_DFL);
 719 #  elif defined(HAVE_SIGACTION)
 720     memset(&action, 0, sizeof(action));
 721
 722     sigemptyset(&action.sa_mask);
 723     action.sa_handler = SIG_DFL;
 724
 725     sigaction(SIGTERM, &action, NULL);
 726     sigaction(SIGCHLD, &action, NULL);
 727     sigaction(SIGPIPE, &action, NULL);
 728 #  else
 729     signal(SIGTERM, SIG_DFL);
 730     signal(SIGCHLD, SIG_DFL);
 731     signal(SIGPIPE, SIG_DFL);
 732 #  endif /* HAVE_SIGSET */
 733
 734     cupsdReleaseSignals();
 735
 736    /*
 737     * Execute the command; if for some reason this doesn't work, log an error
 738     * exit with a non-zero value...
 739     */
 740
 741     if (envp)
 742       execve(exec_path, argv, envp);
 743     else
 744       execv(exec_path, argv);
 745
 746     exit(errno + 100);
 747   }
 748   else if (*pid < 0)
 749   {
 750    /*
 751     * Error - couldn't fork a new process!
 752     */
 753
 754     cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
 755                     strerror(errno));
 756
 757     *pid = 0;
 758   }
 759
 760   cupsdReleaseSignals();
 761 #endif /* HAVE_POSIX_SPAWN */
 762
 763   if (*pid)
 764   {
 765     if (!process_array)
 766       process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
 767
 768     if (process_array)
 769     {
 770       if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
 771       {
 772         proc->pid    = *pid;
 773         proc->job_id = job ? job->id : 0;
 774         _cups_strcpy(proc->name, command);
 775
 776         cupsArrayAdd(process_array, proc);
 777       }
 778     }
 779   }
 780
 781   cupsdLogMessage(CUPSD_LOG_DEBUG2,
 782                   "cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
 783                   "infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
 784                   "profile=%p, job=%p(%d), pid=%p) = %d",
 785                   command, argv, envp, infd, outfd, errfd, backfd, sidefd,
 786                   root, profile, job, job ? job->id : 0, pid, *pid);
 787
 788   return (*pid);
 789 }
 790
 791
 792 /*
 793  * 'compare_procs()' - Compare two processes.
 794  */
 795
 796 static int                              /* O - Result of comparison */
 797 compare_procs(cupsd_proc_t *a,          /* I - First process */
 798               cupsd_proc_t *b)          /* I - Second process */
 799 {
 800   return (a->pid - b->pid);
 801 }
 802
 803
 804 #ifdef HAVE_SANDBOX_H
 805 /*
 806  * 'cupsd_requote()' - Make a regular-expression version of a string.
 807  */
 808
 809 static char *                           /* O - Quoted string */
 810 cupsd_requote(char       *dst,          /* I - Destination buffer */
 811               const char *src,          /* I - Source string */
 812               size_t     dstsize)       /* I - Size of destination buffer */
 813 {
 814   int   ch;                             /* Current character */
 815   char  *dstptr,                        /* Current position in buffer */
 816         *dstend;                        /* End of destination buffer */
 817
 818
 819   dstptr = dst;
 820   dstend = dst + dstsize - 2;
 821
 822   while (*src && dstptr < dstend)
 823   {
 824     ch = *src++;
 825
 826     if (ch == '/' && !*src)
 827       break;                            /* Don't add trailing slash */
 828
 829     if (strchr(".?*()[]^$\\", ch))
 830       *dstptr++ = '\\';
 831
 832     *dstptr++ = (char)ch;
 833   }
 834
 835   *dstptr = '\0';
 836
 837   return (dst);
 838 }
 839 #endif /* HAVE_SANDBOX_H */
 840
 841
 842 /*
 843  * End of "$Id$".
 844  */